// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/interpreter/handler-table-builder.h"

#include "src/heap/factory.h"
#include "src/interpreter/bytecode-register.h"
#include "src/isolate.h"
#include "src/objects-inl.h"

namespace v8 {
namespace internal {
    namespace interpreter {

        HandlerTableBuilder::HandlerTableBuilder(Zone* zone)
            : entries_(zone)
        {
        }

        Handle<ByteArray> HandlerTableBuilder::ToHandlerTable(Isolate* isolate)
        {
            int handler_table_size = static_cast<int>(entries_.size());
            Handle<ByteArray> table_byte_array = isolate->factory()->NewByteArray(
                HandlerTable::LengthForRange(handler_table_size), AllocationType::kOld);
            HandlerTable table(*table_byte_array);
            for (int i = 0; i < handler_table_size; ++i) {
                Entry& entry = entries_[i];
                HandlerTable::CatchPrediction pred = entry.catch_prediction_;
                table.SetRangeStart(i, static_cast<int>(entry.offset_start));
                table.SetRangeEnd(i, static_cast<int>(entry.offset_end));
                table.SetRangeHandler(i, static_cast<int>(entry.offset_target), pred);
                table.SetRangeData(i, entry.context.index());
            }
            return table_byte_array;
        }

        int HandlerTableBuilder::NewHandlerEntry()
        {
            int handler_id = static_cast<int>(entries_.size());
            Entry entry = { 0, 0, 0, Register::invalid_value(), HandlerTable::UNCAUGHT };
            entries_.push_back(entry);
            return handler_id;
        }

        void HandlerTableBuilder::SetTryRegionStart(int handler_id, size_t offset)
        {
            DCHECK(Smi::IsValid(offset)); // Encoding of handler table requires this.
            entries_[handler_id].offset_start = offset;
        }

        void HandlerTableBuilder::SetTryRegionEnd(int handler_id, size_t offset)
        {
            DCHECK(Smi::IsValid(offset)); // Encoding of handler table requires this.
            entries_[handler_id].offset_end = offset;
        }

        void HandlerTableBuilder::SetHandlerTarget(int handler_id, size_t offset)
        {
            DCHECK(Smi::IsValid(offset)); // Encoding of handler table requires this.
            entries_[handler_id].offset_target = offset;
        }

        void HandlerTableBuilder::SetPrediction(
            int handler_id, HandlerTable::CatchPrediction prediction)
        {
            entries_[handler_id].catch_prediction_ = prediction;
        }

        void HandlerTableBuilder::SetContextRegister(int handler_id, Register reg)
        {
            entries_[handler_id].context = reg;
        }

    } // namespace interpreter
} // namespace internal
} // namespace v8
